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400
300
200
1. Step
100
0
0
200 400 600 800 1000 1200
Fig. 3.10.2 Pump specifications only ecoTEC 637 and 837
only ecoTEC pro:
The circulating pump is included in the boiler. The
ecoTEC pro appliances are fitted with a single-stage
pump. The residual pump discharge height depending on
the by-pass valve is shown in Fig. 3.11.
400
300
200
100
0
0
200
400
600
Fig. 3.11 Pump specifications ecoTEC pro
3.11.2 System by-pass
An automatic system by-pass is provided in the boiler.
The boiler is suitable for use in systems with
thermostatic radiator valves and no additional by-pass is
required. The by-pass valve is adjustable, see section 5.3.
3.11.3 Venting
The boiler is fitted with an automatic air vent. Additional
provision should be made to enable the heating system
to be vented during filling and commissioning either by
automatic air vents or manually.
3.12
Condensate trap
The boiler is fitted with a siphonic condensate discharge
(ecoTEC plus) or a condensate trap (ecoTEC pro)
incorporating a water trap of 140 mm.
Instructions for installation and servicing ecoTEC 839592_13
2. Step
1400
1600
1800
Volumeflow [ l/h ]
800
1000 1200
1400
1600
Volumeflow [ l/h ]
2000
1800
General requirements
3
21
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